http://192.253.114.31/Projects/stereograms/stereogram.html
The Patch Stereogram Project offers information on Patch High School's web project, which attempts to provide a resource on stereographic imaging and SIRDS (Single Image Random Dot Stereograms). Users will find several SIRDS images, as well as 'clue' images which show the 3D image hidden in the SIRDS images. There is also information on Patch High School, as well as general information on 3D imaging and SIRDS.